The fact that a few other starting quarterbacks are out of the lineup due to injury or suspension means that about a quarter of the league has gone to its back-up at some point already this season.

“We’re in a knee-jerk society and football has become a knee-jerk game,’’ former Washington quarterback Joe Theismann told the Post. “People ask me how the game has become different. It’s the instability of jobs. As a coach, your job depends on about eight games. As a quarterback, it’s about two quarters.’’